Muller

(redirected from mullers)
Also found in: Dictionary, Thesaurus, Medical.

Muller

Hermann Joseph. 1890--1967, US geneticist, noted for his work on the transmutation of genes by X-rays: Nobel prize for physiology or medicine 1946

Muller

 

a cone-shaped instrument for grinding and pulverizing pigments by hand on a slab, used in the process of preparing paints for painting and printing. Large mullers are made of hard stone (for example, labradorite and porphyry); small ones are made from porcelain, glass, or agate. The slab is usually made from the same material as the muller.


Muller

 

a machine for the mechanical preparation of molding sands and core sands; it mixes silica sands and admixtures, such as molding clay, ground coal, water, and binders. Various types of mixers are used as mullers in the preparation of moldings and core-sand mixtures: standard batch-type mixers, double mixers, oscillating mixers, paddle mixers, and rollerless (vortex) mixers.

Standard batch mixers have a fixed hopper, into which the material to be mixed is fed. Two smooth, vertical rollers move over the layer of material with a circular motion as plows guide the mixed material under the rollers. As the rollers move, the components of the mixture are mixed and become evenly distributed. After 3–12 min of mixing, the prepared mixture is removed through a discharge opening in the bottom of the hopper.

Double mixers have two pairs of vertical rollers and two hoppers interconnected in such a way that their sides form a figure eight. The molding materials are fed continuously into the first hopper, are mixed by the rollers and internal plows, and are then transferred by an external plow to the second hopper, where more mixing takes place. The prepared mixture is then removed from the second hopper by an external plow. Double mixers can produce up to 400 tons/hr, and the mixture can be removed either continuously or in batches.

An oscillating mixer has two or three horizontal rollers suspended on oscillators connected to a vertical shaft. As the shaft revolves, the rollers come close to the rubber-faced wall of the mixer’s hopper. The material to be mixed is fed by scrapers into the gap between the rotating rollers and the wall of the hopper. A batch is mixed in 1.5–3 min. The prepared mixture is removed through a small door in the wall of the hopper.

A paddle mixer may have one or two (parallel) shafts equipped with paddles mounted in a helical line and turning inside a trough. When the shaft turns, the mixture is mixed and simultaneously transported along the trough toward the outlet. Such machines can produce mixtures continuously or in batches.

A rollerless, or vortex, mixer has a vertical rotating shaft and a fixed hopper. The working elements are bent springs with heads at the end that press against the side of the hopper and mix the sand.

In the USSR the most commonly used equipment for preparing molding-sand and core-sand mixes are the standard batch-type models 1A11 and 1A12, which have a productivity of 6 and 15 tons/hr, respectively. For molding sands, the model 115 and 116 oscillating mixers, which produce 34 and 47.5 tons/hr, respectively, are most common. The model 4727 paddle mixers, which produce 3.2 tons/hr, are used to prepare granular, self-hardening mixtures.

REFERENCES

Aksenov, P. N. Oborudovanie liteinykh tsekhov. Moscow, 1968.
Okromeshko, N. V. Mekhanizatsiia i avtomatizatsiia liteinykh tsekhov. Moscow, 1960.

G. V. PROSIANIK

muller

[′məl·ər]
(engineering)
A foundry sand-mixing machine.
References in periodicals archive ?
As Woods explains, Muller sought to accomplish this by "engaging the audience in interpretive practices" (1).
In each case, Wood draws on the original text, archival materials regarding production history, and published reviews in order to assess both Muller's intended address and the actual impact of the works.
Thus Keim insistently relates the 'Theatralitat' of Muller's work to the wider context Of postmodern cultural theory, to the production of meaning through performance, not just in theatre but in society at large.
Of all his works, Loos considered that the Villa Muller was the best example of such spatial economy.
* dry collection systems in which sand system baghouse dusts are re-wetted and recycled through AO blackwater tanks to mullers and/or sand coolers.
Green sand conditioning begins well before the muller. If the return sand system does not adequately cool and hydrate the hot, dry shakeout sand, then even the best mulling will have a difficult time creating somewhat uniform clay hydration.
Proper control of the percentage of clay, sand, moisture and temperature in the return sand will greatly enhance the ability to hit target properties coming out of the muller. The following areas are critical and should be given priority during the return sand system audit.
Inputs consisted of incoming sand temperature, conductivity, measured water flow, muller motor amps and bond rate.
A foundry must always be aware of the mechanical and electrical state of its mullers. As mullers age, the amount of effective mulling can significantly decrease.
This difference was expected because the samples were taken over a period of time from a continuous production muller rather than remulling in an attempt to achieve a homogeneous batch of sand.
A probe system also has been designed for high-shear type mullers. in this system probes are pushed into the rotating mass of sand in the mixer after a batch of sand is introduced.
(Along these lines, it is significant that neither Muller seems to have any interest in distinguishing herself from her sister; in transcribed interviews, as in drawing style, they speak as one.) Yet the artists' efforts to locate the individual within the category are clearly earnest, and ultimately their work is profoundly--if unsentimentally--humanist, sensitive to the plight of both the individual striving for self-definition and the group struggling to retain its coherence.